/Engine/Source/Runtime/GeometryCore/Public/Spatial/PriorityOrderPoints.h
Either order by descending ImportanceWeight, or try to additionally un-clump the points  such that if we only look at the first N points, they will cover the overall space as well as possible while still favoring higher ImportanceWeight points in each local region.
struct FPriorityOrderPoints
TArray< int32 >
Order
Outputs.
int32
SpatialLevels
Inputs.